51104 Single Direction Thrust Bearing 20x35x10 Ball Bearing Customizable

51104 Single-Direction Thrust Bearing: 20mm ID, 35mm OD, 10mm Thick For Equipment

As an important member of the thrust ball bearing family, the 51104 flat thrust bearing plays a key role in axial support across various mechanical fields. With its precise dimensional design and reliable performance, it provides solid guarantees for the stable operation of various equipment.

1. Basic Dimensions

1. Inner Diameter (d): 20mm. This inner diameter is carefully designed to fit numerous standard shaft diameters, ensuring tight coordination with the shaft for efficient transmission of axial force. It prevents shaft system displacement and lays the foundation for the stable operation of the mechanical system.

2. Outer Diameter (D): 35mm. It forms a scientific ratio with the inner diameter, not only providing sufficient installation space for the rolling element and cage assembly but also meeting the compact layout requirements of equipment, enabling efficient load-bearing within limited space.

3. Thickness (T): 10mm. The thickness design balances load-bearing strength and operational flexibility. When bearing axial loads, it ensures the bearing ring has sufficient strength to avoid deformation; meanwhile, the reasonable thickness control reduces friction during rolling element movement, minimizes operational heat generation, and improves equipment operating efficiency.

2. Structural Features

It adopts a separable structure, consisting of a shaft washer (interference fit with the shaft, rotating with the shaft), a housing washer (transition fit with the equipment housing or support base, fixed and non-rotating), and a steel ball-cage assembly. This structure allows individual installation and disassembly of each component, greatly simplifying the equipment assembly process, facilitating later maintenance, and reducing maintenance costs and downtime. It should be noted that the 51104 flat thrust bearing can only bear unidirectional axial loads and cannot withstand radial loads. In practical applications, it needs to be matched with radial support components (such as deep groove ball bearings) to form a complete shafting support solution.

3. Core Materials

1. Bearing Rings: High-carbon chromium bearing steel, such as SAE-52100 or GCr15, is mostly used. After quenching and tempering, this type of steel reaches a hardness of HRC 60-64, featuring excellent wear resistance, fatigue resistance, and impact toughness. It can withstand contact stress caused by axial loads for a long time, significantly extending the bearing's service life. In special working conditions (such as strong corrosion environments), stainless steel is used to enhance the bearing's corrosion resistance.

2. Rolling Elements: Bearing steel balls of the same material as the bearing rings are usually adopted. The surface undergoes precision grinding, with roundness error controlled at the micron level, effectively reducing friction loss when in contact with the bearing rings and ensuring smooth operation. For extreme working conditions such as high temperature and high speed, ceramic rolling elements (e.g., silicon nitride ceramics) can be selected, which have advantages of high hardness, low friction, high temperature resistance, and corrosion resistance, further optimizing the bearing's performance.

3. Cages: Conventional models often use nylon materials (e.g., PA66), which are lightweight, have a low friction coefficient, and good self-lubrication. They can accurately guide the uniform distribution of steel balls, prevent collision between rolling elements, and ensure stable bearing operation. In high-speed or high-temperature environments, stamped steel or brass cages are used to enhance structural stability and high-temperature resistance.

4. Key Performance Parameters (Taking Mainstream Brands as Examples)

1. Rated Load: The basic dynamic load rating (C) is approximately 15.8-16.2kN, and the basic static load rating (C₀) is about 28.0-29.0kN. It can meet the axial load requirements of various small and medium-sized equipment, such as small elevators and light conveyors.

2. Speed Performance: The limiting speed is approximately 5300-5600r/min under grease lubrication, and can reach 7800-8500r/min under oil lubrication. In actual use, the speed should be adjusted reasonably according to factors such as lubrication method and load magnitude to prevent overheating damage to the bearing due to overspeed.

3. Applicable Temperature: Under conventional working conditions, the applicable temperature range is -40℃ to 120℃. With high-temperature grease and special materials, the applicable temperature can be extended to above 150℃, meeting the operation requirements of equipment under different ambient temperatures.

5. Lubrication Requirements

1. Grease Lubrication: Suitable for scenarios with relatively low speed (≤5000r/min) and inconvenient oil replenishment. Lithium-based grease (e.g., Grade EP2) is recommended, with a filling amount of 1/3-1/2 of the bearing's internal space. Grease lubrication not only provides good dustproof and sealing effects but also effectively reduces friction and wear.

2. Oil Lubrication: Applicable to high-speed (>5000r/min) or high-load working conditions. It is recommended to use ISO VG32 or VG46 extreme-pressure industrial gear oil, with lubrication performed through oil bath or oil injection. Oil lubrication can quickly dissipate heat generated during operation, significantly improving heat dissipation efficiency and ensuring stable operation of the bearing under harsh working conditions.

6. Typical Application Fields

Based on its dimensional and performance characteristics, the 51104 flat thrust bearing is widely used in multiple fields:

1. Small and Medium-sized Mechanical Equipment: Such as the lifting mechanism of dental treatment chairs, the paper-feeding shaft support of barcode printers, and the axial positioning of traction machines for small elevators. It undertakes key tasks of axial positioning and load transmission.

2. Transmission Systems: Commonly used in the axial support of reducer output shafts and motor end covers, as well as the axial limit of Roots pump rotors. It ensures stable operation of the transmission system and efficient power transmission.

3. Light Industry and Agricultural Equipment: Applied in the roller shafts of knitting machinery, the hydraulic systems of small tractors, and the main shafts of canning processing equipment. It adapts to the light-load and medium-low speed operation characteristics of the equipment, providing reliable support for stable equipment work.

With its precise dimensions of 20mm inner diameter, 35mm outer diameter, and 10mm thickness, combined with a separable structure, high-quality wear-resistant materials, and stable load-bearing performance, the 51104 flat thrust bearing has become an ideal choice for many small and medium-sized machinery that require high axial support accuracy and space compactness, providing reliable axial support guarantees for the long-term stable operation of equipment.